The portable edition of Adobe Illustrator CS3 is a zip file that contains all of the necessary files to run the application. This makes it easy to transport and use on multiple computers, without the need for a formal installation process.
If you really need portable vector editing, try Inkscape Portable from PortableApps.com. It's legal, updated, and won't give your computer digital tuberculosis. But if you still type that old search string... you know what you're doing. And we won't judge. adobe illustrator cs3 portable editionzip new